ABP框架中一对多，多对多关系的处理以及功能界面的处理（2）

<el-tree
      ref="tree"
      class="filter-tree"
      style="padding-top:10px"
     :data="treedata"
      node-key="id"
      icon-class="el-icon-price-tag"
      default-expand-all
      highlight-current
      :show-checkbox="showcheck"
      :filter-node-method="filterNode"
    :default-checked-keys="checkedList"
    >

async getlist() { // 树列表数据获取
      // 获取全部功能列表
      var param = { SkipCount: 0, MaxResultCount: 1000, Tag: 'web' }
      var treeList = [] // 所有功能列表
      await menu.GetAll(param).then(data => {
        treeList = data.result.items
      })
      // console.log(treeList)
      // 获取角色菜单列表
      var grantedList = []
      if (this.roleId && typeof (this.roleId) !== 'undefined') {
        param = { RoleId: this.roleId, MaxResultCount: 1000, MenuTag: 'web' }
        await role.GetMenusInRole(param).then(data => {
          grantedList = data.result.items
        })
      }
      // console.log(grantedList)

/// <summary>
    /// 品牌简单信息
    /// </summary>
    public class BrandItemDto
    {
        /// <summary>
        /// 品牌ID
        /// </summary>
        public virtual long Id { get; set; }
        /// <summary>
        /// 品牌编码
        /// </summary>
        public virtual string BrandCode { get; set; }
        /// <summary>
        /// 品牌名称
        /// </summary>
        public virtual string BrandName { get; set; }
    }

/// <summary>
        /// 对记录进行转义
        /// </summary>
        /// <param name="item">dto数据对象</param>
        /// <returns></returns>
        protected override void ConvertDto(ProductTypeDto item)
        {
            //重写ConvertDto方法，返回其他关系数据
            var bindedBrands = GetBindedBrands(item.Id).Result.Items;
            //获取关联品牌的ID列表
            var brandIds = bindedBrands.Select(s => s.Id).ToArray();
            //获取关联品牌的对象列表
            var brandDtos = bindedBrands.Select(ObjectMapper.Map<BrandItemDto>).ToList();
            item.BindBrands = brandIds;     //纯ID集合
            item.BindBrandItems = brandDtos;//ID，BrandName,BrandCode 信息集合
        }

<el-table-column align="center" label="绑定品牌列表">
    <template slot-scope="scope">
      <el-tag
        v-for="opt in scope.row.bindBrandItems"
        :key="opt.id"
        type="primary"
        :disable-transitions="false"
      >
        {{ opt.brandName }}
      </el-tag>
    </template>
  </el-table-column>

<el-form-item label="品牌关联" prop="bindBrands">
    <el-checkbox-group v-model="editForm.bindBrands" style="padding:10px;box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1)">
      <el-checkbox v-for="(item, i) in brandList" :key="i" :label="item.id">{{ item.brandName }}</el-checkbox>
    </el-checkbox-group>
  </el-form-item>

/// <summary>
        /// 重写创建操作，写入额外的信息
        /// </summary>
        /// <param name="input">商品类型对象DTO</param>
        /// <returns></returns>
        public override async Task<ProductTypeDto> CreateAsync(CreateProductTypeDto input)
        {
            CheckCreatePermission();
            var entity = MapToEntity(input);
            await Repository.InsertAsync(entity);
            await CurrentUnitOfWork.SaveChangesAsync();
            //写入中间表关系
            if (input.BindBrands != null)
            {
                foreach (var brandId in input.BindBrands)
                {
                    //增加新增的
                    await _brandTypeRepository.InsertAsync(new BrandType(AbpSession.TenantId, brandId, entity.Id));
                }
            }
            return MapToEntityDto(entity);
        }
        /// <summary>
        /// 重写更新操作，更新新的关系数据
        /// </summary>
        /// <param name="input">商品类型对象DTO</param>
        /// <returns></returns>
        public override async Task<ProductTypeDto> UpdateAsync(ProductTypeDto input)
        {
            //保存主记录
            var dto = await base.UpdateAsync(input);
            //写入中间表关系
            if (input.BindBrands != null)
            {
                var brandsDto = new BrandsToProductTypeDto() { BrandIds = input.BindBrands, ProductTypeId = input.Id };
                await AddBrandToType(brandsDto);
            }
            return dto;
        }

/// <summary>
    /// 商品类型，应用层服务接口实现
    /// </summary>
    [AbpAuthorize]
    public class ProductTypeAppService : MyAsyncServiceBase<ProductType, ProductTypeDto, long, ProductTypePagedDto, CreateProductTypeDto, ProductTypeDto>, IProductTypeAppService
    {
        private readonly IRepository<ProductType, long> _repository;//业务对象仓储对象
        private readonly IRepository<User, long> _userRepository;//用户信息仓储对象
        private readonly IRepository<BrandType, long> _brandTypeRepository;//品牌分类中间表对象仓储对象
        private readonly IRepository<Brand, long> _brandRepository;//业务对象仓储对象
        public ProductTypeAppService(IRepository<ProductType, long> repository, IRepository<BrandType, long> brandTypeRepository, IRepository<Brand, long> brandRepository, IRepository<User, long> userRepository) : base(repository)
        {
            _repository = repository;
            _brandTypeRepository = brandTypeRepository;
            _brandRepository = brandRepository;
            _userRepository = userRepository;
        }

/// <summary>
        /// 添加品牌到分类
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public async Task AddBrandToType(BrandsToProductTypeDto input)
        {
            var typeInfo = Repository.GetAsync(input.ProductTypeId);
            if (typeInfo != null)
            {
                //获取与中间表联合的查询表达式
                var query = from cb in _brandTypeRepository.GetAll()
                            join b in _brandRepository.GetAll() on cb.Brand_ID equals b.Id
                            where cb.ProductType_ID == input.ProductTypeId
                            select b;
                var oldNotInNewList = query.Where(p => !input.BrandIds.Contains(p.Id)).ToList();
                foreach (var info in oldNotInNewList)
                {
                    //移除已有，但不在添加列表中的
                    await _brandTypeRepository.DeleteAsync(m => m.ProductType_ID == input.ProductTypeId && m.Brand_ID == info.Id);
                }
                if (input.BrandIds != null)
                {
                    //获取已有绑定列表
                    var currentBrands = query.ToList();
                    foreach (var brandid in input.BrandIds)
                    {
                        if (currentBrands.Any(cr => cr.Id == brandid))
                        {
                            continue; //已有重复的跳过
                        }
                        //否则增加新增的
                        await _brandTypeRepository.InsertAsync(new BrandType(AbpSession.TenantId, brandid, input.ProductTypeId));
                    }
                }
            }
        }